ASI Glass. Integrated Architecture Powered by the Sun

Transcription

1 ASI Glass Integrated Architecture Powered by the Sun

2 BIPV Building Integrated Photovoltaics with ASI Glass All the benefits of glass plus integrated solar power Whether a facade or a roof, today s building envelope fulfills multiple purposes. Along with its conventional roles of providing privacy and protection from rain and noise, additional factors are becoming increasingly important, such as thermal insulation and shading. All of these requirements are addressed by the shell of the building. Today, building integrated photovoltaic systems are able to provide all of these functions plus solar electricity. Benefits of ASI Glass Solar electricity generation Light management Comfort Effective shading Glare protection Thermal management Innovative architecture Cost savings by combining and integrating several functions

3 Design Glass Shade C Thermal Insulation Solar Electricity

4 Design Design options with ASI Glass Integrated solar modules from transparent to opaque ASI Glass elements are available in various design options. Depending on the application and the desired architectural appearance, this flexibility always allows the designer to optimize the integration of solar panels into the building. ASI THRU ASI OPAK ASI OPAK White ASI OPAK Creative Line ASI OPAK Elegance Line ASI THRU is a semi-transparent module with a see-through effect. It is available in laminated form or as double glazed units. ASI OPAK is the technology for homogeneous facade surfaces, where no vision is required. ASI OPAK White offers a completely uniform appearance. ASI OPAK Creative Line and Elegance Line offer unique surface patterns, allowing new architectural design possibilities. Customer-specific patterns can also be produced. The following designs and module constructions are available as customer specific solutions: ASI FADE provides a gradual fade to clear glass ASI THRU facade ASI SHADE integrates shading louvers with double glazed units to provide the ultimate in glare protection Anti-reflective coating All of the above options laminated or double glazed are also available with AMIRAN anti-reflective glass from SCHOTT. This significantly reduces the average light reflectivity, enhances the performance of the solar power and eliminates obtrusive reflections. ASI OPAK Elegance Line facade ASI OPAK White facade

5 Glass Engineering with ASI Glass Effective with conventional glazing systems There are special solar cell encapsulations available for every application, for example, laminated glass for overhead applications. Used horizontally or vertically, ASI Glass solar modules fulfil the requirements of the construction industry and can be used with almost all conventional framing systems. Static load requirements can be met by changing the type and thickness of the glass panes. The encapsulation of ASI solar cells in laminated or double glazed constructions makes use of proven technology and manufacturing methods. In addition to a large number of standard types and sizes, customized solutions can also be provided. Please contact us for further details. Module options with ASI Glass Double glazing Laminate Glass laminates and double glazed units incorporating ASI solar panels are compatible with commercially available metal profile systems. Canopy Insulated roof glazing Louvers The maximum size of ASI Glass modules is 1.2m x 2.4m (~4 x 7 10 ) Cables are within the framing system Opaque cladding Insulated facade Integrated roof panels

6 Shade Solar control and shading with ASI Glass Minimizing heat gain in summer In order to reduce the influx of thermal energy during the summer months, the glazing must be provided with some sort of sun shielding. This may be accomplished by additional coatings on the glass, the roller blinds or Venetian blinds. The energy transmission of the entire solar spectrum is determined by the g-value the smaller the g-value, the more effective the shielding. In the table below various sun shielding techniques are compared with ASI THRU in double glazing elements. 100% Heat Heat Reflection Solar Heat Gain Coefficient (SHGC) Comparison of different glazing and shading systems with ASI THRU double glazed units SHGC (g-value) GLAZING Single glass pane ~80% Double glazed with uncoated glass ~80% Double glazed with solar control coating 30-70% ASI THRU double glazed unit 10 % SHADING SYSTEMS External Venetian blind (white)* 12% External fabric canopy* 9% Internal roller blind (white)* 40% * at values in combination with double glazed windows with a SHGC = 61% and a U-value of 1.4 W/m 2 K (0.24 Btu/hr ft 2 F) 10% Heat Summer Typical Applications ASI Glass Double Glazed ASI Glass Laminate

7 C Thermal Insulation Building insulation with ASI Glass Minimizing thermal loss in winter The U-value refers to the thermal insulation effect of the building; it is the coefficient of heat transmission for the materials that comprise the building shell. The glazing must serve two purposes: it must be transparent to sunlight, but insulate from thermal radiation. Modern glass coatings (low-e coatings) facilitate the separation of the shorter wavelength sunlight from the longer wavelength thermal radiation. In the table below U-values of various glazing systems are compared to those of ASI THRU double glazing. The photovoltaic ASI THRU double glazed elements reach low U-values comparable with high-quality conventional double glazing; hence they are suitable for large areas of glazing without sacrificing any loss in thermal comfort during the winter and, most importantly, with the additional benefit of generating electricity. Retaining Heat Comparison of the heat transmittance values of ASI THRU double glazed units to other glazing configurations U-Value (EN673) American Standard Single glass pane or laminated glass 5-6 W/m 2 K Btu/hr ft 2 F Double glazed unit without low-e coating 2.7 W/m 2 K 0.48 Btu/hr ft 2 F Double glazed unit with low-e coating 1.2 W/m 2 K 0.21 Btu/hr ft 2 F ASI THRU double glazed unit 1.2 W/m 2 K 0.21 Btu/hr ft 2 F Winter ASI Glass Double Glazed

8 Solar Electricity The ASI solar cell technology Optimized for building integration The ASI semiconductor converts sunlight directly into electrical power. It is applied in very thin layers (<1 µm) on glass, so only one gram of semiconductor material is needed per square meter (~11 square feet) of modular surface. The semiconductor material consists of 99% silicon, derived from quartz sand. The ASI semiconductor is free of heavy metals like cadmium. Why ASI modules for building integration? In addition to their homogeneous surfaces, thin film solar modules based on amorphous silicon have decisive advantages for building integration compared with crystalline solar cells. Reliable power output even at low light levels down to 10% of full sun - a typical light condition on overcast days or caused by shading from neighboring buildings. The very small temperature coefficient of the power output guarantees almost full power at higher cell temperatures, as typically encountered with building integration. ASI Thin Film Solar Cell - How it works Sunlight Glass Glass The ASI Solar Cell is made of amorphous silicon. The sunlight frees electrons in the semiconductor layer. Each strip is one solar cell. The cells are connected by laser line bridges. Up to 20% more energy per rated Watt Peak (Wp) compared with crystalline solar cells The performance at low light levels or high cell temperatures leads to significantly higher energy yields during the course of a year. This has been proven by independent institutes (copies of these studies are available on request) ASI solar modules stable energy yield and long lifetime Average DC power [kw] years years Average DC power measurements at the solar facade of the Bavarian Ministry of Environment In 1993 the Bavarian Ministry of Environment installed one of the first ASI OPAK facades. Ten years later, in 2003 the building was fully renovated. The ASI OPAK facade is still in place. Measurements of the solar facade, conducted by an independent research institute, show the long term stability offered by ASI technology. The graph shows the average DC power output over the course of the last 10 years.

9 Solar Electricity Solar electricity Electrical energy The nominal electrical power of solar modules is rated according to Standard Test Conditions. This value is usually given in Watt peak (Wp). The energy yield during the course of a year depends on the location and orientation (azimuth angle and tilt angle) of the photovoltaic elements. The graph shows the principal energy yield depending on the azimuth angle and tilt angle of the module based on a system in New York City NY, USA. The actual energy yield may depend upon the local situation, such as shading influences of neighboring buildings. Annual energy output (kwh/m 2 ) 100% 80% 60% Azimuth angle + 90 West East - 90 Tilt angle Photovoltaic output in relation to orientation and tilt angle based on a system corresponding to the latitude of New York City, NY, USA Stabilized nominal power according to Standard Test Conditions ASI THRU ASI OPAK 42 Wp/m 2 53 Wp/m Wp/ft Wp/ft 2 Solar modules generate DC-power that is converted by the inverter to AC. The inverter connects the photovoltaic system to the grid, the most effective and economical way of using solar electricity for a building. Usually most of the solar power is consumed by lighting and plug loads in the building. Excess power is fed into the grid for credit. If the energy power supplier offers a buy back plan, all power generated may be fed into the grid. A grid-connected PV system is built usually with the following components: 1: Solar modules 4: Inverter 2: Combiner box 5: Meter 3: Cabling

10 Cost Savings with ASI Glass Comparison with conventional glazing systems Besides generating electricity, ASI Glass elements fulfill different functions such as the glazing or shading of a building envelope. The costs for these construction materials are eliminated when ASI Glass elements are used. Subtracting the savings on the conventional construction material from the overall costs for the ASI Glass photovoltaic system, results in the actual costs for the photovoltaic system. Conventional ASI Glass Facade Cost difference Facade Electrical between ASI Glass Shading system installation and a if needed conventional installation Replace Conventional glazing or cladding material ASI Glass elements Construction work Sub construction: Cladding, framing system etc. Additional costs for PV system Energy Yield Average costs for different construction materials Material costs $/ft 2 (e/m 2 ) 15 (150) 10 (100) 5 (50) Laminated glass Spandrel Double glazing with low-e coating Laminated and fritted glass Shading systems such as louvers Marble wall cladding The figure shows budget prices for conventional glazing or cladding materials and shading systems. These materials could be replaced by the ASI Glass elements.

11 About RWE SCHOTT Solar RWE SCHOTT Solar is a joint venture of the RWE and SCHOTT Groups. The RWE Group is an international multi-utility concern with core businesses in electricity, gas, water, waste management and recycling. The SCHOTT Group is a leading international specialty glass manufacturer. The RWE and SCHOTT companies combined realized sales of over $50 billion in 2003, and employ more than 150,000 people worldwide. RWE SCHOTT Solar GmbH is a world leading producer of high quality solar modules. RWE SCHOTT Solar s headquarters is in Alzenau, Germany. The production of the ASI Glass solar cells is located near Munich, Germany. RWE SCHOTT Solar, Inc. is North America s leading manufacturer and distributor of solar power components and systems, serving customers throughout America. SCHOTT sales offices throughout the world offer up-to-date technical service. ASI Glass is marketed in North America exclusively by SCHOTT North America, Inc., located in Elmsford, NY.

12 Inspiration - Powered by the sun We would be pleased to advise on how you can use ASI Glass products in your projects. Please contact us or your local ASI Glass representative. RWE SCHOTT Solar GmbH Hermann-Oberth-Str Putzbrunn, Germany Please contact the local SCHOTT Office at the following address Glass for Special Applications SCHOTT North America, Inc. 555 Taxter Road Elmsford, NY Phone: , Fax: info@us.schott.com

13 Inspiration - Powered by the sun We would be pleased to advise on how you can use ASI Glass products in your projects. Please contact us or your local ASI Glass representative. RWE SCHOTT Solar GmbH Hermann-Oberth-Str Putzbrunn, Germany Please contact the local SCHOTT Office at the following address SCHOTT UK Ltd Sales Office Drummond Road, Stafford ST16 3EL Phone: Fax: info.uk@schott.com